Sodium metal should be kept under:
- (A) Petrol
- (B) Alcohol
- (C) Water
- (D) Kerosene
- (D) Kerosene
Which of the following isotope is called as heavy hydrogen?
- (A) Tritium
- (B) Protium
- (C) Deuterium
- (D) Titanium
- (C) Deuterium
Heavy water is _______.
- (A) Tritium oxide
- (B) D2O
- (C) Boiled water
- (D) River water
- (B) D2O
Heavy water is called heavy because:
- (A) It is denser than water
- (B) It is an oxide of deuterium
- (C) It has a heavy or bad taste
- (D) It is an oxide of hydrogen
- (B) It is an oxide of deuterium
Which of the following is the most efficient engine?
- (A) Steam engine
- (B) Electric engine
- (C) Diesel engine
- (D) Petrol engine
- (B) Electric engine
Which of the following is the least efficient engine?
- (A) Electric engine
- (B) Petrol engine
- (C) Steam engine
- (D) Diesel engine
- (C) Steam engine
Chlorophyll is a naturally occurring chelate compound in which central metal is:
- (A) Iron
- (B) Calcium
- (C) Magnesium
- (D) Copper
- (C) Magnesium
Which metal forms an amalgam with other metals?
- (A) Zinc
- (B) Tin
- (C) Lead
- (D) Mercury
- (D) Mercury
Quartz crystals are normally used in quartz clocks etc. is chemically:
- (A) Sodium Silicate
- (B) Germanium Oxide
- (C) Silicon Dioxide
- (D) Carbon Monoxide
- (C) Silicon Dioxide
Which of the following is used as a lubricant?
- (A) Silica
- (B) Iron oxide
- (C) Diamond
- (D) Graphite
- (D) Graphite
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